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Coulomb’s Law p. 538 in your book. Charged objects & electrical force Two electrically charged objects exert a force on each other. Opposite charges ATTRACT.

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Presentation on theme: "Coulomb’s Law p. 538 in your book. Charged objects & electrical force Two electrically charged objects exert a force on each other. Opposite charges ATTRACT."— Presentation transcript:

1 Coulomb’s Law p. 538 in your book

2 Charged objects & electrical force Two electrically charged objects exert a force on each other. Opposite charges ATTRACT Notice the forces are “equal but opposite”

3 Charged objects & electrical force Two electrically charged objects exert a force on each other. Like charges REPEL Notice the forces are “equal but opposite”

4 Coulomb’s Law

5

6 Example 1 p. 539 Two objects, whose charges are +1.0C and -1.0C are separated by 1.0km. Find the magnitude of the attractive force that either charge exerts on the other. F = 9.0x10 3 N

7 Notice anything familiar? Similarities: Both are inverse square laws The force is directed along a line between the two objects Difference: Electrostatic force can be either attractive or repulsive Gravitational force is always attractive

8 Notice anything familiar?

9 More than 2 point charges We can use Coulomb’s law to determine the net electrostatic force acting on a point charge (q 1 ) due to multiple other point charges (q 2 and q 3 ).

10 More than 2 point charges First determine the force (magnitude and direction!) that q 3 exerts on q 1 (ignore q 2 ) Then determine the force (magnitude and direction!) that q 2 exerts on q 1 (ignore q 3 )

11 More than 2 point charges The net force on q1 is the vector sum of these two forces.

12 Example 4 p. 541 Determine the magnitude and direction of the net electrostatic force on q 1. +5.7N

13 Assignment Coulomb’s law worksheet


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